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        <a href="web2py.gluon.validators-module.html">Module&nbsp;validators</a> ::
        Class&nbsp;IS_URL
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class IS_URL</h1><span class="codelink"><a href="web2py.gluon.validators-pysrc.html#IS_URL">source&nbsp;code</a></span><br /><br />
<pre class="base-tree">
object --+    
         |    
 <a href="web2py.gluon.validators.Validator-class.html">Validator</a> --+
             |
            <strong class="uidshort">IS_URL</strong>
</pre>

<hr />
<pre class="literalblock">

Rejects a URL string if any of the following is true:
   * The string is empty or None
   * The string uses characters that are not allowed in a URL
   * The string breaks any of the HTTP syntactic rules
   * The URL scheme specified (if one is specified) is not 'http' or 'https'
   * The top-level domain (if a host name is specified) does not exist

(These rules are based on RFC 2616: http://www.faqs.org/rfcs/rfc2616.html)

This function only checks the URL's syntax. It does not check that the URL
points to a real document, for example, or that it otherwise makes sense
semantically. This function does automatically prepend 'http://' in front
of a URL in the case of an abbreviated URL (e.g. 'google.ca').

If the parameter mode='generic' is used, then this function's behavior
changes. It then rejects a URL string if any of the following is true:
   * The string is empty or None
   * The string uses characters that are not allowed in a URL
   * The URL scheme specified (if one is specified) is not valid

(These rules are based on RFC 2396: http://www.faqs.org/rfcs/rfc2396.html)

The list of allowed schemes is customizable with the allowed_schemes
parameter. If you exclude None from the list, then abbreviated URLs
(lacking a scheme such as 'http') will be rejected.

The default prepended scheme is customizable with the prepend_scheme
parameter. If you set prepend_scheme to None then prepending will be
disabled. URLs that require prepending to parse will still be accepted,
but the return value will not be modified.

IS_URL is compatible with the Internationalized Domain Name (IDN) standard
specified in RFC 3490 (http://tools.ietf.org/html/rfc3490). As a result,
URLs can be regular strings or unicode strings.
If the URL's domain component (e.g. google.ca) contains non-US-ASCII
letters, then the domain will be converted into Punycode (defined in
RFC 3492, http://tools.ietf.org/html/rfc3492). IS_URL goes a bit beyond
the standards, and allows non-US-ASCII characters to be present in the path
and query components of the URL as well. These non-US-ASCII characters will
be escaped using the standard '%20' type syntax. e.g. the unicode
character with hex code 0x4e86 will become '%4e%86'

Code Examples::

    INPUT(_type='text', _name='name', requires=IS_URL())
    &gt;&gt;&gt; IS_URL()('abc.com')
    ('http://abc.com', None)

    INPUT(_type='text', _name='name', requires=IS_URL(mode='generic'))
    &gt;&gt;&gt; IS_URL(mode='generic')('abc.com')
    ('abc.com', None)

    INPUT(_type='text', _name='name',
        requires=IS_URL(allowed_schemes=['https'], prepend_scheme='https'))
    &gt;&gt;&gt; IS_URL(allowed_schemes=['https'], prepend_scheme='https')('https://abc.com')
    ('https://abc.com', None)

    INPUT(_type='text', _name='name',
        requires=IS_URL(prepend_scheme='https'))
    &gt;&gt;&gt; IS_URL(prepend_scheme='https')('abc.com')
    ('https://abc.com', None)

    INPUT(_type='text', _name='name',
        requires=IS_URL(mode='generic', allowed_schemes=['ftps', 'https'],
            prepend_scheme='https'))
    &gt;&gt;&gt; IS_URL(mode='generic', allowed_schemes=['ftps', 'https'], prepend_scheme='https')('https://abc.com')
    ('https://abc.com', None)
    &gt;&gt;&gt; IS_URL(mode='generic', allowed_schemes=['ftps', 'https', None], prepend_scheme='https')('abc.com')
    ('abc.com', None)

@author: Jonathan Benn

</pre><br /><br />

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          <td><span class="summary-sig"><a href="web2py.gluon.validators.IS_URL-class.html#__init__" class="summary-sig-name">__init__</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">error_message</span>=<span class="summary-sig-default"><code class="variable-quote">'</code><code class="variable-string">enter a valid URL</code><code class="variable-quote">'</code></span>,
        <span class="summary-sig-arg">mode</span>=<span class="summary-sig-default"><code class="variable-quote">'</code><code class="variable-string">http</code><code class="variable-quote">'</code></span>,
        <span class="summary-sig-arg">allowed_schemes</span>=<span class="summary-sig-default">1</span>,
        <span class="summary-sig-arg">prepend_scheme</span>=<span class="summary-sig-default"><code class="variable-quote">'</code><code class="variable-string">http</code><code class="variable-quote">'</code></span>)</span><br />
      :param error_message: a string, the error message to give the end user
    if the URL does not validate
:param allowed_schemes: a list containing strings or None.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="web2py.gluon.validators-pysrc.html#IS_URL.__init__">source&nbsp;code</a></span>
            
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          <td><span class="summary-sig"><a href="web2py.gluon.validators.IS_URL-class.html#__call__" class="summary-sig-name">__call__</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">value</span>)</span><br />
      :param value: a unicode or regular string, the URL to validate
:returns: a (string, string) tuple, where tuple[0] is the modified
    input value and tuple[1] is either None (success!) or the
    string error_message.</td>
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            <span class="codelink"><a href="web2py.gluon.validators-pysrc.html#IS_URL.__call__">source&nbsp;code</a></span>
            
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    <p class="indent-wrapped-lines"><b>Inherited from <code><a href="web2py.gluon.validators.Validator-class.html">Validator</a></code></b>:
      <code><a href="web2py.gluon.validators.Validator-class.html#formatter">formatter</a></code>
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      <code>__delattr__</code>,
      <code>__getattribute__</code>,
      <code>__hash__</code>,
      <code>__new__</code>,
      <code>__reduce__</code>,
      <code>__reduce_ex__</code>,
      <code>__repr__</code>,
      <code>__setattr__</code>,
      <code>__str__</code>
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<a name="__init__"></a>
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  <h3 class="epydoc"><span class="sig"><span class="sig-name">__init__</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">error_message</span>=<span class="sig-default"><code class="variable-quote">'</code><code class="variable-string">enter a valid URL</code><code class="variable-quote">'</code></span>,
        <span class="sig-arg">mode</span>=<span class="sig-default"><code class="variable-quote">'</code><code class="variable-string">http</code><code class="variable-quote">'</code></span>,
        <span class="sig-arg">allowed_schemes</span>=<span class="sig-default">1</span>,
        <span class="sig-arg">prepend_scheme</span>=<span class="sig-default"><code class="variable-quote">'</code><code class="variable-string">http</code><code class="variable-quote">'</code></span>)</span>
    <br /><em class="fname">(Constructor)</em>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="web2py.gluon.validators-pysrc.html#IS_URL.__init__">source&nbsp;code</a></span>&nbsp;
    </td>
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  <pre class="literalblock">

:param error_message: a string, the error message to give the end user
    if the URL does not validate
:param allowed_schemes: a list containing strings or None. Each element
    is a scheme the inputed URL is allowed to use
:param prepend_scheme: a string, this scheme is prepended if it's
    necessary to make the URL valid

</pre>
  <dl class="fields">
    <dt>Overrides:
      object.__init__
    </dt>
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  <h3 class="epydoc"><span class="sig"><span class="sig-name">__call__</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">value</span>)</span>
    <br /><em class="fname">(Call operator)</em>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="web2py.gluon.validators-pysrc.html#IS_URL.__call__">source&nbsp;code</a></span>&nbsp;
    </td>
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  <pre class="literalblock">

:param value: a unicode or regular string, the URL to validate
:returns: a (string, string) tuple, where tuple[0] is the modified
    input value and tuple[1] is either None (success!) or the
    string error_message. The input value will never be modified in the
    case of an error. However, if there is success then the input URL
    may be modified to (1) prepend a scheme, and/or (2) convert a
    non-compliant unicode URL into a compliant US-ASCII version.

</pre>
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